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Superstructure Project Case Study Steel vs. Concrete.

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Presentation on theme: "Superstructure Project Case Study Steel vs. Concrete."— Presentation transcript:

1 Superstructure Project Case Study Steel vs. Concrete

2 Short Span Steel Bridges Compete and Win

3 Case Study Bridges: Side-by-Side Comparison Audrain County, MO Bridge 411 Built 2012 Steel 4 Girders 47.5 ft Span, 24 ft Roadway Width 2 ft Structural Depth No Skew Audrain County, MO Bridge 336 Built 2012 Precast 6 Hollowcore Slab Girders 50.5 ft Span, 24 ft Roadway Width 2 ft Structural Depth 20 o Skew Steel Concrete

4 Total Bridge Costs Material= $41,764 Labor= $24,125 Equipment = $21,521 GuardRail = $ 7,895 Rock= $ 8,302 Engineering= $ 8,246 TOTAL= $111,853 Total Bridge Costs Material = $67,450 Labor = $26,110 Equipment= $24,966 GuardRail = $ 6,603 Rock= $ 7,571 Engineering= $21,335 TOTAL= $154,035 Case Study Bridges: Side-by-Side Comparison Steel Concrete

5 Total Bridge Costs per ft 2 Total Cost= $ / ft 2 Total Construction Cost= $ / ft 2 (no Engineering) Adjusted Construction Cost= $ / ft 2 (no Engineering or Rock) Total Bridge Costs per ft 2 Total Cost= $ / ft 2 Total Construction Cost= $ / ft 2 (no Engineering) Adjusted Construction Cost= $ / ft 2 (no Engineering or Rock) Case Study Bridges: Side-by-Side Comparison Steel Concrete

6 Superstucture Costs Material Girders= $21,463 Deck Panels= $ 7999 Reinf Steel= $ 3135 Concrete= $ 4180 Labor= $ 5522 Equipment*= $ 500 SUPER TOTAL= $42,799 SUPER TOTAL= $37.54 / ft 2 Superstructure Costs Material Slab Girders= $50,765 Deck Panels= $ 0 Reinf Steel= $ 724 Concrete= $ 965 Labor= $ 4884 Equipment* = $ 4000 SUPER TOTAL= $61,338 SUPER TOTAL= $50.61 / ft 2 Case Study Bridges: Superstructure Only Comparison (Remove Site Prep, Abutment, Grading & Finishing, Guardrail, Engineering, Rock, Etc) Steel Concrete *County Crane (30 Ton) used for Steel, Larger Rented Crane (100 Ton) Required for Concrete (Equivalent County Crane Cost is $1520, would result in Steel Cost of $38.88 / ft 2 )

7 Case Study Bridges: Audrain County, MO Steel: Superstructure $37.54 per ft 2 Concrete: Superstructure Cost $50.61 per ft 2 Cost increase of 35% Same bridge conditions: Structural Depth = 2 ft (No Difference in Approaches) Roadway Width = 24 ft Same Abutments for Both Can be Used (Steel Could Use Lighter) Same Guard Rail System Same Work Crew

8 Lighter Cranes Required (Owner Cranes Can Save Costs) Steel Bridge - Advantages

9 Lighter Abutments Possible for Steel Bridges Steel Bridge - Advantages

10 Cast-in-Place Deck on Prestressed Concrete Deck Panels Steel Bridge - Economy

11 Simple and Practical Details Steel Bridge - Economy

12 Elastomeric Bearings & Integral Abutments Steel Bridge - Economy

13 Weathering Steel Steel Bridge - Economy

14 Other Bridges in Missouri – Total Constructed Costs Steel Concrete BRIDGE NUMBER YEAR BUILT SPAN LENGTH SKEW COST SUMMARY LABOR $14,568$21,705$15,853$24,765$31,949 $12,065$15,379$14,674$19,044 MATERIAL $56,676$53,593$46,282$92,821$69,357 $51,589$54,450$50,576$46,850 ROCK $6,170$6,216$3,694$8,235$6,501 $5,135$7,549$5,378$3,621 EQUIPMENT $7,487$12,026$7,017$19,579$15,266 $5,568$10,952$11,093$14,742 GUARDRAIL $4,715$7,146$3,961$7,003 $4,737$4,663$5,356$3,323 CONSTRUCTION COSTS $89,616$100,686$76,807$152,403$130,076 $79,094$92,993$87,077$87,580 CONSTR COST PER SQ FT $ $ $ $ $ $ $ $ $ 91.23

15 Other Bridges in Missouri – Average Total Constructed Costs Steel Concrete BRIDGE NUMBER YEAR BUILT SPAN LENGTH SKEW COST SUMMARY $ / ft 2 LABOR$21,768$16.05$15,291$15.99 MATERIAL$63,746$46.99$50,866$53.19 ROCK$6,163$4.54$5,421$5.67 EQUIPMENT$12,275$9.05$10,589$11.07 GUARDRAIL$5,966$4.40$4,520$4.73 CONSTRUCTION COSTS$109,918$86,686 CONSTR COST PER SQ FT $ $ 96.32

16 Bottom Line: Short Span Steel Bridges Compete and Win Questions or Comments?


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